Paypal with CodeIgniter?

[eluser]Iwasignited[/eluser]
Hello, Im new to PHP and I choose CodeIgniter framework to start working with.
I have a question. How can we integrate Paypal with PHP source using CodeIgniter.
Something like 'run a SQL query after user paying'.
Please help me.
Thanks.

[eluser]danmontgomery[/eluser]
http://codeigniter.com/wiki/PayPal_Lib/

[eluser]Iwasignited[/eluser]
Thank you.
I looked at the user guide table content and didnt find it.
Sorry for my mislooking.
Best Regards.

[eluser]Ravi ரவி[/eluser]
http://codeigniter.com/wiki/PayPal_Lib/ ... in this url where is the download link...